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run code in 150+ php & hhvm versions
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<?php $zahlen = ['10', 10]; var_dump($zahlen[0]); var_dump($zahlen[1]); var_dump(is_numeric($zahlen[0])); var_dump(is_numeric($zahlen[1])); var_dump(is_int($zahlen[0])); var_dump(is_int($zahlen[1])); ?>
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(2) "10" int(10) bool(true) bool(true) bool(false) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ksIsb on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/ksIsb on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/ksIsb on line 3
Process exited with code 255.